it was on at 7pm on BBC One on Christmas Day 2008. It is now available on DVD, for around £13
No. Just read a book about The Knights of the Round Table if you want to see Merlin, or watch BBC America or HBO.
The Christmas Special will air on BBC America on Christmas Day 9pm, the same day it airs in Britain.
Katie McGrath plays Morgana in BBC's Merlin
The Christmas Special of Doctor Who will be shown on Christmas Day on BBC One. Presumably as they have tended to during the 9/10th Doctor eras the BBC will be showing it at around 6/7pm that evening.
BBC
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In the BBC Programs of Merlin, her name is Hunnith (without a second name).
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I don't know the time, but it airs Christmas Day on BBC America.
It's going to be playing on the Space channel starting Sept 13, 2010
You can watch the last episodes of Merlin on BBC/ITV I Player.